System for fastening a rail, and tensioning clamp for a system of this type

Abstract

A system for fastening a rail having a rail foot, a web positioned thereon, and a rail head, includes a tensioning clamp with a carrying plate. The carrying plate has a central portion for bracing the tensioning clamp on the carrying plate, at least one torsion portion branching off from the central portion in the lateral direction and a holding arm connected to the torsion portion via a curved transition portion. The holding arm extends, starting from the transition portion, counter to the torsion portion and exerts via the free end of its end portion a resilient holding-down force on the rail foot of the rail to be fastened. The length of the torsion portion and the course of the transition portion is adapted to each other in such a way that at least the transition portion is guided without supports laterally past a region of the carrying plate that is associated with the central portion of the tensioning clamp. The end portion of the holding arm is angled away from the torsion portion in such a way that it points in the direction of the web of the rail to be fastened.

The invention claimed is: 
     
       1. A system for fastening a rail which has a rail foot, a web positioned thereon, a rail head and a carrying plate, the system comprising a tensioning clamp held on the carrying plate, the tensioning clamp having a central portion for bracing the tensioning clamp on the carrying plate, at least one torsion portion branching off from the central portion in a lateral direction, and a holding arm which is connected to the torsion portion via a curved transition portion, the holding arm extends, starting from the transition portion, counter to the torsion portion and exerts, via a free end of its end portion, a resilient holding-down force on the rail foot of the rail to be fastened, the length of the torsion portion and the course of the transition portion being adapted to each other in such a way that at least the transition portion is guided without supports laterally past a region of the carrying plate that is associated with the central portion of the tensioning clamp, wherein the end portion of the holding arm is angled so as to point away from the torsion portion in such a way that it points, in an assembly position, in a direction of the web of the rail to be fastened. 
     
     
       2. The system according to  claim 1 , wherein the end portion of the holding arm is angled in such a way that a notional extension of the end portion encloses, in the assembly position, an angle of less than 90° with the web of the rail. 
     
     
       3. The system according to  claim 1 , wherein, viewed from above, a partial piece of the holding arm that issues from the transition portion is oriented in the direction of the torsion portion. 
     
     
       4. The system according to  claim 1 , further comprising a rib, wherein the carrying plate carries on its upper side associated with the tensioning clamp the rib on which the central portion of the tensioning clamp is supported. 
     
     
       5. The system according to  claim 4 , wherein the tensioning clamp is braced on the carrying plate by means of a tensioning means fastened to the rib. 
     
     
       6. The system according to  claim 4 , wherein the smallest clear width between the torsion portion and the holding arm is at least equal to a thickness of the rib. 
     
     
       7. The system according to  claim 6 , wherein the angled end portion of the holding arm is formed integrally with a partial piece of the holding arm oriented in the direction of the torsion portion. 
     
     
       8. The system according to  claim 7 , wherein dimensions of a clear width between the torsion portion and the transition point, at which, viewed from above, the partial piece of the holding arm that is directed in the direction of the torsion portion merges with the angled end portion of said holding arm, are such that the holding arm is supported, in the assembly position, in a region of a transition point at a face of the rib that is associated with the rail to be fastened. 
     
     
       9. The system according to  claim 5 , wherein, in the assembly position, the torsion portion runs parallel to the rib, without resting against said rib. 
     
     
       10. The system according to  claim 1 , wherein the tensioning clamp is ω-shaped in its configuration, wherein the central portion is shaped in a looped manner and there issues therefrom the two torsion portions which are oriented counter to each other and to which the respective holding arm having the angled end portion is connected via the respective transition portion. 
     
     
       11. The system according to  claim 1 , wherein the torsion portion of the tensioning clamp is supported, in the assembly position, on the carrying plate.